Microstructural factors affecting hardness property of dual two-phase intermetallic alloys based on Ni3Al-Ni3V pseudo-binary alloy system

被引：43

作者：

Kawahara, K. ^{[1
]}

Kaneno, Y. ^{[1
]}

Kakitsuji, A. ^{[2
]}

Takasugi, T. ^{[1
]}

机构：

[1] Osaka Prefecture Univ, Dept Mat Sci, Naka Ku, Osaka 5998531, Japan

[2] Technol Res Inst Osaka Prefecture, Izumi Ku, Osaka 5941157, Japan

来源：

INTERMETALLICS | 2009年 / 17卷 / 11期

关键词：

Multiphase intermetallics; Mechanical properties at high temperatures; Heat treatment; Microstructure; PACKED NI3X X; V TYPE STRUCTURES; MECHANICAL PROPERTY; PHASE RELATION; AL; EVOLUTION; NB;

D O I：

10.1016/j.intermet.2009.04.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dual two-phase intermetallic alloys that have alloy compositions of Ni75AlxNb2.5V22.5-x and are composed of geometrically close packed (GCP) Ni3Al (L1(2)) and Ni3V (D0(22)) phases containing Nb were studied, focusing on the relationship between microstructural parameter and high-temperature hardness property. The two-phase microstructures defined by primary Ni3Al precipitates and eutectoid (i.e., channel) region (consisting of Ni3Al and Ni3V Phases) were characterized in terms of size, volume fraction and number density of primary Ni3Al precipitates. The high-temperature hardness was evaluated as a function of temperature. The volume fraction of primary Ni3Al phase precipitates, and interfacial area between primary Ni3Al precipitates and channel region were found to be important factors affecting the hardness of the dual two-phase intermetallic alloys. Possible mechanisms responsible for the observed extra hardening were discussed, taking the role of interfaces among the constituent phases into consideration. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：938 / 944

页数：7

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